Agolf ball is struck at ground level. the speed of the golf ball as a function of the time is shown in the figure, where t = 0 at the instant the ball is struck. the scaling on the vertical axis is set by va= 21 m/s and vb= 32.3 m/s. (a) how far does the golf ball travel horizontally before returning to ground level? (b) what is the maximum height above ground level attained by the ball?

You are your friend move a new refrigerator into his kitchen. you apply a horizontal force of 252 n in the negative x direction to try and move the 56 kg refrigerator. the coefficient of static friction is 0.61. (a) how much static frictional force does the floor exert on the refrigerator? give both magnitude (in n) and direction. magnitude n direction (b) what maximum force (in n) do you need to apply before the refrigerator starts to move?